feat(artwork): add UIThumbnailSize constant and update cache warmer to pre-cache thumbnails

Signed-off-by: Deluan <deluan@navidrome.org>

core/artwork/cache_warmer.go

@@ -142,14 +142,15 @@ func (a *cacheWarmer) doCacheImage(ctx context.Context, id model.ArtworkID) erro
 	ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
 	defer cancel()
 
-	r, _, err := a.artwork.Get(ctx, id, consts.UICoverArtSize, true)
-	if err != nil {
-		return fmt.Errorf("caching id='%s': %w", id, err)
-	}
-	defer r.Close()
-	_, err = io.Copy(io.Discard, r)
-	if err != nil {
-		return err
+	for _, size := range []int{consts.UICoverArtSize, consts.UIThumbnailSize} {
+		r, _, err := a.artwork.Get(ctx, id, size, true)
+		if err != nil {
+			return fmt.Errorf("caching id='%s', size=%d: %w", id, size, err)
+		}
+		defer r.Close()
+		if _, err = io.Copy(io.Discard, r); err != nil {
+			return err
+		}
 	}
 	return nil
 }

core/artwork/cache_warmer_test.go

@@ -6,11 +6,13 @@ import (
 	"fmt"
 	"io"
 	"strings"
+	"sync"
 	"sync/atomic"
 	"time"
 
 	"github.com/navidrome/navidrome/conf"
 	"github.com/navidrome/navidrome/conf/configtest"
+	"github.com/navidrome/navidrome/consts"
 	"github.com/navidrome/navidrome/model"
 	"github.com/navidrome/navidrome/utils/cache"
 	. "github.com/onsi/ginkgo/v2"
@@ -173,20 +175,47 @@ var _ = Describe("CacheWarmer", func() {
 				return len(cw.buffer)
 			}).Should(Equal(0))
 		})
+
+		It("pre-caches both UICoverArtSize and UIThumbnailSize", func() {
+			cw := NewCacheWarmer(aw, fc).(*cacheWarmer)
+			cw.PreCache(model.MustParseArtworkID("al-1"))
+
+			Eventually(func() int {
+				cw.mutex.Lock()
+				defer cw.mutex.Unlock()
+				return len(cw.buffer)
+			}).Should(Equal(0))
+
+			sizes := aw.getCachedSizes()
+			Expect(sizes).To(ContainElements(consts.UICoverArtSize, consts.UIThumbnailSize))
+		})
 	})
 })
 
 type mockArtwork struct {
-	err error
+	err         error
+	mu          sync.Mutex
+	cachedSizes []int
 }
 
 func (m *mockArtwork) Get(ctx context.Context, artID model.ArtworkID, size int, square bool) (io.ReadCloser, time.Time, error) {
 	if m.err != nil {
 		return nil, time.Time{}, m.err
 	}
+	m.mu.Lock()
+	m.cachedSizes = append(m.cachedSizes, size)
+	m.mu.Unlock()
 	return io.NopCloser(strings.NewReader("test")), time.Now(), nil
 }
 
+func (m *mockArtwork) getCachedSizes() []int {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	result := make([]int, len(m.cachedSizes))
+	copy(result, m.cachedSizes)
+	return result
+}
+
 func (m *mockArtwork) GetOrPlaceholder(ctx context.Context, id string, size int, square bool) (io.ReadCloser, time.Time, error) {
 	return m.Get(ctx, model.ArtworkID{}, size, square)
 }